Lulu (and everyone else) -
I am almost 37, and my husband is 33.
I am a cancer survivor, had breast cancer at 33. Many younger breast cancer survivors are recommended not to get pregnant after treatment (assuming they still can - chemo can wreak havoc on your body, and some patients take drugs after chemo that puts them into early menopause), as breast cancers are often hormonally responsive. My tumor wass not, but my oncologist still said, "It would be best if you didn't have kids for a minimum of 2 years, at least 5 preferably...and you might want to think about NOT having them."
Many other young survivors I know mourned terribly, planning adoption or embryo freezing prior to treatment. I felt relief. I'll admit it - the thought that came first to my mind was, "Oh, thank God, the pressure is off me FOREVER."
I was unhappily married at the time of "the b**b", as I call it, actually filed for divorce during treatment, but I am remarried now ( 3 years later) and couldn't be happier. I love my husband so much that we have had many talks about this. The big thing is, I love him so much that I WOULD have a kid with him. It is just that the kid part isn't appealing. What is appealing is having a child with him and making everyone else so overjoyed. But that isn't good enough - unless the KID becomes appealing, I don't think it's right.
We have not decided NO, forever. No is for now. We have scheduled talks about it for after each big trip that we take, but so far, we are very happy the way we are. I predict that we will stay child-free, though if either of us has a big change of heart, you never know. My brother and SIL are pregnant with our first nephew now, so that will probably be a big help in our decision!
I am lucky, because I can shut people up with one sentence about "my oncologist" - but just remember - this is your decision and no one else's. It feels uncomfortable to answer the questions of people who just want you to share the joy they feel (without thinking that different things bring joy to different people!!), but it would feel a lot more uncomfortable to do something that deep in your heart, you are ambivilent about.
And I'll end this with a fun and unrelated story since I just told ya'll about the cancer thing and we're on a Disney board - I went to WDW during chemo for a weekend when I was feeling good. The stares I got, OMG!!! Nearly everyone who looked at me smiled or looked away immediately. The kids were kids, asked their parents what was wrong with my hair, why I was bald, all that stuff. But in the MK one day there was a grown man who literally stopped in his tracks and stared with his big ol' trap open - his kid was actually pulling on him ("dad, come ON!!!"). I smiled sweetly and asked him laughingly if he wanted to take a picture, as that would last longer!! Poor guy, he stammered..and I just told him not to worry, I was doing OK and my hair would all grow back, and why should I deny myself a trip to Disney - look at all the bald guys around!!!

I do have a picture of me with Mickey from that trip - Mickey's hand on top of my scarved head - it is on my refrigerator so I remember never to whine about having a bad hair day again...